Overview of Current Week

Overview of the Current Week

2025/11/28 - 2025/12/05

A red tide has been sighted over the past week, the Inter-departmental Red Tide Working Group reported today (December 5).

The red tide was spotted by staff of the Environmental Protection Department (EPD) on November 28 in Deep Bay. The red tide still persists. No associated fish deaths have been reported as of today.

A spokesman for the working group said, "The red tide was formed by Phaeocystis globosa, which is commonly found in Hong Kong waters. According to literature overseas, the algal species can produce foam that may affect fish."

Red tide is a natural phenomenon. The AFCD's proactive phytoplankton monitoring programme will continue to monitor red tide occurrences to minimise the impact on the mariculture industry and the public.

Please click here to view the location of red tide sighted in Hong Kong waters.

Last update: 2025/12/05 noon

Red Tide Reporting Network

We welcome your assistance in reporting red tide to us. Please record the following information:
(1) location of red tide
(2) colour of the seawater
(3) extent of the red tide
(4) occurrence of dead fish and any other abnormal features observed around the red tide.

Please report to:
3468 3714 (office hours) OR 1823 (outside office hours)